Yeah people have already said it here but i'll reiterate, you have to make people respect the Shake and :en Shake, that thing has saved my life on numerous occasions. People typically don't respect the Shake and get hurt from it. Don't be afraid to throw out a :en Smoke Bomb a few times (like 1 or 2) while your opponent is turtling, it chips so people don't like to see that health go down, which makes them very impetuous to attack, that is where you punish hard with optimal combos. Optimal combos again as already said in the thread, is something you're not doing, I usually do mid to high 30's (which you need to learn more of, I think if Pyrrhon PMed you, they should be good combos) just so that people become hesitant on attacking you so brashly. Then they back off, and then you chip them again, and then they come in and then you punish, ad nauseum. I can't judge your oki, but you should (as again already said in the thread) try to d+4, b+2, 3 trap to help combo off your opponent hesitant at getting up, you should also be trying your hardest for that 10% untechable :en Smoke bomb, it'll save you if you keep chipping off your opponent. And keep doing that rushdown too, mixing up a pseudo-zoning strategy with your rushdown as well, will confuse your opponents to no end. It makes them think twice about how they will approach you.
Additionally, learning your matchups which Apocalips has made a good thread on matchups. It might be a little outdated but the strategies are the same (if not very similar).
Also, look closely at Cabibi's how to play Smoke thread and the thread which outlines all of the :en Shake exceptions, it'll be very useful to read.